Bearing for turn-tables or the like.



E. S. BENNETT. BEARING FOR TURN TABLES 0R THE LIKE.

APPLICATION FILED 00T.19. 1903.

N0 MODEL.

PATENTED SEPT. 6, 1904.

UNITED STATES Patented September 6, 1904.

PATENT OFFICE.

BEARING FOR TURN-TABLES OR THE LIKE SPECIFICATION forming part of Letters Patent No. 769,460, dated September 6, 1904.

Application filed October 19, 1903. Serial No. 177,589. (No model.)

To all 107mm, it may concern.'

Be it known that I, ERAsTUs S. BENNETT, a citizen of the United States, residing at New York city, New York, have invented certain new and useful Improvements in Bearings for Tu rn-T ables or the Like, of which the following is a specification.

My invention has been devised for use in connection with mining' machinery intended more particularly for handling' placer material, such machines comprising' a scoop or dipper supported by a boom, which in turn is carried by a rotary table or platform. My invention, however, is not limited in its application to mining' machinery, but may be employed in dredging' or excavating' machinery or in any apparatus wherein a boom or other part is supported and carried bya turn-table. It has been found from experience in machinery of this class that the weight of the parts is so great that ordinary bearings will not stand the wear, and it is impossible to ernploy a bearing requiring' lubrication` particularly at the points adjacent the connection between the boom and the turn-table, at which points the supporting' strain of the boom is located.

By my invention I aim to provide an antifriction roller-bearing' between the turn-table and the frame, said roller bearing' or bearings being' located adjacent the lower end of the boom where it connects with the turn-table.

The invention consists in the features, cornbination, and arrangement of parts, as will be hereinafter described, and particularly pointed out in the claims.

In the accompanying' drawing's, Figure 1 is a plan view of a turn-table which is representative of such table as used on a mining', excavating', dredging', or any other machine of this class. Fig. Q is a side view of Fig. 1. Fig's. 3 and 4. are respectively side and plan views of the ordinary form of roller-bearing' arranged between the turn-table and the main frame or platform of the machine. Fig. 5 is a vertical sectional view across one of the I- beams to which the boom is pivoted, showing' also a part of the platform in section and my improved form of bearing in connection therewith. Fig'. 6 is a sectional View through the bearing', taken at right ang'les to the view shown in Fig'. 5; and Fig. 7 is a plan view of the bearing.

In the drawings, 1 represent-s a turn-table of any suitable form, 2. the mast, and 3 3 the I-beams, supported n the turn-table on each side of the mast, arranged parallel with each other, and having at one end bearings et in which a cross shaft or rod 5 is supported, which forms the pivoted bearing of a boom 6. This boom carries the dipper or scoop intended to take up the placer material or to do the excavating', and it, together with the boom and the operating' connections associated with the dipper, are of great weig'ht, and by my invention I sustain the weight of these parts in a special manner, as will be now described.

The improved bearings constituting' my invention are located at the points 6X, as shown in Figs. 1 and 2, adjacent the lower end of the boom and preferably between the angleiron 0r I beams 3 and the main deck or platform 7. For this purpose the angle-iron or I beams have their vertical webs 8 provided with opening's 9, and extending through these opening's in the I-beams are track-sections l0, there being' one track-section for each of the bearing's. This track-section l0 is secured by bolts l1 to the upper side of the turn-table, and the said bolts 11 also hold in place a lower track-section 12 for each bearing', said lower track being' held up against the lower face of the turn-table. The track-sections and 19. of each bearing have horizontal faces or ways 13 and curved end portions 14, which when the two track-sections are in place form, as

shown in Fig'. 5, scmicircular end portions to the tracks. These track-sections are each provided with ribs 15 along' their margins, and the surface 16 between these ribs forms the bearing-surface for a series of rollers 17, connected together by links 18 into an endless chain, as shown in Fig'. 5. The endless chain passes through openings 19 in the turn-table and encircles the tracks, as clearly shown in said ligure.

In order to protect the bearingV from dust and dirt, a shield Q0 is provided, extending from the turn-table 1 to the sides of the vertical web of the I-beam. The endless chain of rollers bear upon a track 2l, secured to the main deck or platform, and they sustain the weight of the platform and boom by affordingantifriction support for the track 12 and the turn-table, to which said track is secured. As shown in Fig. l, the antifrictionbearing extends concentric to the axis or mast of the turn-table, and this is illustrated also in Fig. 7 By reason of the concentric relation of the endless chain to the turn-table I arrange the tracks lO and l2 at a slight inclination, as shown at Fig. 6, and the rollers are slightly conical.

From the above it will be seen that I provide an antifriction-bearing needing no lubrication and located adjacent the point of connection between the boom and the turn-table, so as to sustain the weight of the boom and the parts carried thereby on the main deck or platform.

I claim as my inventionl. In combination with a boom of a shovel or dredge, a roller-bearing for sustaining thelower end of the said boom.

2. In combination with a turn-table,an antifriction-bearing comprising an endless chain of rollers passing above and below the said turn-table and arranged to bear on the main deck, substantially as described.

3. In combination with a turn-table, tracksections on the upper and lower faces of the same and an endless chain of rollers passing through openings in the turn-table and along the track-sections, said rollers bearing upon the main deck or platform, substantially as described.

4. In combination with a turn-table, an angle-iron or I beam supported thereon and having an opening therethrough and an antifriction-bearing consisting of an endless chain of rollers extending to points on opposite sides of the angle-iron or I beam and between the turn-table and main deck, substantially as described.

5. In combinationwith a turn-table an angle-iron or I beam supported thereon, a boom pivoted to the angle-iron, said angle-iron having an opening therethrough, an antifrictionbearing comprising track means on the upper and lower faces of the turn-table and an endless chain of rollers passing around the said track through openings in the turn-table and through the openings in the angle-iron` substantially as described.

6. In combination with a turn-table, a pair of angle-iron beams supported thereon parallel with each other, a boom pivoted between the said angle-irons and an antifriction-bearing at each of the angle-irons consisting of an endless chain of rollers operating between the turn-table and the main deck and below the angle-iron, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

ERASTUS S. BENNETT.

Witnesses:

MYRON L. JUSTIN, J. K. Sco'r'r. 

